By Andrew John Theodore Colin

ISBN-10: 0333231155

ISBN-13: 9780333231159

ISBN-10: 1349035610

ISBN-13: 9781349035618

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Any reference that may be made to a 'complete program' will not include the job description. JOB CAFANDREW, :CAQP47 ALGOL68 *ALGOL68 EXAMPLE 'BEGIN' 'INT' A, B, C; READ (A); READ (B); C: = A+B; PRINT (C) 'END' Program (in the Algol-68R dialect) 'FINISH' Job description (which terminates program) Job description (introduces data) The actual data *DATA 37 46 *END ENDJOB } **** Job description (terminates whole job) Consider again the example given above. Rewritten in the standard Algol 68 notation, it is 1 begin int a, b, c; 2 read (a); 3 read (b); 4 c:=a+b; 5 print (c) 6 end (data) 37 Note that the line numbers are not part of the program but are included, here and elsewhere in complete programs, for reference only.

In actual fact the messages are quite easy to interpret if you know what to look for. When it is handling your job the computer can pass through three different stages, each one producing its own characteristic error reports. First, the machine analyses your job description. If it finds a mistake it abandons the job immediately without even considering the program at all. If, in your results, the program is not even printed out you can assume that your job description was wrong. Check it (with someone else if you cannot find the mistake yourself) and submit the corrected job again.

The form of the job description that you will have to use may be quite different. You will see that job-description statements are needed (a) (b) (c) (d) at at at at the the the the head of the job end of the program beginning of the data end of the job. Introduction to Algol 68 27 Since the job description is not part of the program, and is in any case not written in Algol 68, there will be no further mention of it in this book. Any reference that may be made to a 'complete program' will not include the job description.

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Programming and Problem-Solving in Algol 68 by Andrew John Theodore Colin


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